AT&T (T) is trialing a free Wi-Fi service at DFW International Airport that requires users...

AT&T (T) is trialing a free Wi-Fi service at DFW International Airport that requires users to watch a 30-second ad in exchange for 40 minutes of web surfing. Given airports often charge $5-$10/hour for web access, many travelers will probably take the deal. Should AT&T's trial expand and/or other service providers follow suit, it could be a problem for Boingo (WIFI), whose business model involves selling subscriptions for its Wi-Fi hotspot network. (also)